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[Test] System.Text.Json.Tests crashes in ReflectionMemberAccessor.CreateParameterizedConstructor for non-public [JsonConstructor] #130678
Description
Build Information
Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1506631
Build error leg or test failing: System.Text.Json.Tests.WorkItemExecution
Pull request: #129457
Failing leg
• Helix work item: System.Text.Json.Tests
• Queue: azurelinux.3.amd64.open.rt
• Job: d8ef37cc-cc4a-4936-a547-fe9551536f99
• Console log: https://helixr1107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-pull-129457-merge-d8ef37cccc4a4936a5/System.Text.Json.Tests/1/console.b5bc1750.log?helixlogtype=result
Failure signature
Error Message
Process terminated. Assertion failed.
constructor.DeclaringType == type && constructor.IsPublic && !constructor.IsStatic
at System.Diagnostics.DebugProvider.Fail(String message, String detailMessage) in /_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/DebugProvider.cs:line 22
at System.Diagnostics.Debug.Fail(String message, String detailMessage) in /_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Debug.cs:line 135
at System.Diagnostics.Debug.Assert(Boolean condition, String message) in /_/src/libraries/System.Private.CoreLib/src/System/Diagnostics/Debug.cs:line 88
at System.Text.Json.Serialization.Metadata.ReflectionMemberAccessor.CreateParameterizedConstructor[PrivateParameterizedCtor_WithAttribute,Int32,Object,Object,Object](ConstructorInfo constructor) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/ReflectionMemberAccessor.cs:line 73
at System.Text.Json.Serialization.Converters.SmallObjectWithParameterizedConstructorConverter`5[[System.Text.Json.Serialization.Tests.PrivateParameterizedCtor_WithAttribute, System.Text.Json.Tests, Version=11.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51],[System.Int32, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Object, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e]].ConfigureJsonTypeInfoUsingReflection(JsonTypeInfo jsonTypeInfo, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Converters/Object/ObjectWithParameterizedConstructorConverter.Small.cs:line 126
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateTypeInfoCore(Type type, JsonConverter converter, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/DefaultJsonTypeInfoResolver.Helpers.cs:line 78
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.CreateJsonTypeInfo(Type type, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/DefaultJsonTypeInfoResolver.cs:line 82
at System.Text.Json.Serialization.Metadata.DefaultJsonTypeInfoResolver.GetTypeInfo(Type type, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/Metadata/DefaultJsonTypeInfoResolver.cs:line 59
at System.Text.Json.JsonSerializerOptions.GetTypeInfoNoCaching(Type type) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.cs:line 1030
at System.Text.Json.JsonSerializerOptions.CachingContext.CreateCacheEntry(Type type, CachingContext context) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs:line 292
at System.Collections.Concurrent.ConcurrentDictionary`2[[System.Type, System.Private.CoreLib, Version=11.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e],[System.Text.Json.JsonSerializerOptions.CachingContext.CacheEntry, System.Text.Json, Version=11.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51]].GetOrAdd[CachingContext](Type key, Func`3 valueFactory, CachingContext factoryArgument) in /_/src/libraries/System.Private.CoreLib/src/System/Collections/Concurrent/ConcurrentDictionary.cs:line 1243
at System.Text.Json.JsonSerializerOptions.CachingContext.GetOrAddCacheEntry(Type type) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs:line 282
at System.Text.Json.JsonSerializerOptions.CachingContext.GetOrAddTypeInfo(Type type, Boolean fallBackToNearestAncestorType) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs:line 261
at System.Text.Json.JsonSerializerOptions.GetTypeInfoInternal(Type type, Boolean ensureConfigured, Nullable`1 ensureNotNull, Boolean resolveIfMutable, Boolean fallBackToNearestAncestorType) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs:line 143
at System.Text.Json.JsonSerializerOptions.GetTypeInfoForRootType(Type type, Boolean fallBackToNearestAncestorType) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializerOptions.Caching.cs:line 183
at System.Text.Json.JsonSerializer.GetTypeInfo(JsonSerializerOptions options, Type inputType) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Helpers.cs:line 45
at System.Text.Json.JsonSerializer.Deserialize(ReadOnlySpan`1 json, Type returnType, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Read.String.cs:line 160
at System.Text.Json.Serialization.Tests.JsonSerializerWrapper.SpanSerializerWrapper.DeserializeWrapper(String json, Type type, JsonSerializerOptions options) in /_/src/libraries/System.Text.Json/tests/System.Text.Json.Tests/Serialization/JsonSerializerWrapper.Reflection.cs:line 83
at System.Text.Json.Serialization.Tests.ConstructorTests.NonPublicCtors_WithJsonConstructorAttribute_WorksAsExpected(Type type) in /_/src/libraries/System.Text.Json/tests/Common/ConstructorTests/ConstructorTests.AttributePresence.cs:line 30
at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[<NonPublicCtors_WithJsonConstructorAttribute_WorksAsExpected>d__1](<NonPublicCtors_WithJsonConstructorAttribute_WorksAsExpected>d__1& stateMachine) in /_/src/libraries/System.Private.CoreLib/src/System/Runtime/CompilerServices/AsyncMethodBuilderCore.cs:line 38
at System.Text.Json.Serialization.Tests.ConstructorTests.NonPublicCtors_WithJsonConstructorAttribute_WorksAsExpected(Type type)
Process exits with:
Aborted (core dumped) ... Exit Code:134 (SIGABRT)
{
"ErrorMessage": "constructor.DeclaringType == type && constructor.IsPublic && !constructor.IsStatic",
"ErrorPattern": "",
"BuildRetry": false,
"ExcludeConsoleLog": false
}Copilot's brief analysis
Why this is likely happening
The failing test ( NonPublicCtors_WithJsonConstructorAttribute_WorksAsExpected ) exercises non-public ctors annotated with [JsonConstructor] (e.g. PrivateParameterizedCtor_WithAttribute ).
The crashing path goes through CreateParameterizedConstructor<T,...> in ReflectionMemberAccessor , which asserts the constructor is public. In this scenario the ctor is intentionally non-public, so the invariant is violated and the assert terminates the process in this checked/assert-enabled run.
Initial triage hypothesis
Likely a regression in constructor-selection/delegate-creation for non-public [JsonConstructor] where the non-public path is reaching a helper that assumes constructor.IsPublic == true instead of using a non-public-compatible path.
Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1506631
Error message validated: [constructor.DeclaringType == type && constructor.IsPublic && !constructor.IsStatic]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 7/14/2026 12:55:17 PM UTC
Report
| Build | Repository | Test | Pull Request |
|---|---|---|---|
| 1506631 | dotnet/runtime | System.Text.Json.Tests.WorkItemExecution | #129457 |
Summary
| 24-Hour Hit Count | 7-Day Hit Count | 1-Month Count |
|---|---|---|
| 1 | 1 | 1 |
Activity
dotnet-policy-service commentedon Jul 14, 2026
Tagging subscribers to this area: @dotnet/area-system-text-json
See info in area-owners.md if you want to be subscribed.
eiriktsarpalis commentedon Jul 14, 2026
This got fixed in #130618